It is call will be all sensible people you others and the planet, you be included in it lives participative and solidary way, which will lead you to better world will be all. Key words: Bioethics, Western culture, Century XXI. ' ' I have already some time apercebi from that, since my first years, he receives many false opinions as true, and of that what later I established in principles so badly assured, it could not be seno mui uncertain doubtful and, in way that me was necessary to seriously try a time in my life, to undo me of all the opinions the one that until then credit gives, and to again start everything since the beddings, if wanted to establish something of firm and constant in sciences. (…..) ' '. (Discardings, 1973, pg.93). The cartesian doubt is the starting point of Discardings for all the thought that developed, and seems that it folloied it throughout all its life, therefore in ' ' Meditaes' ' , published nine years before its death (1641), it remains as condition essential of its proper one to think philosophical. I invite, therefore the readers, to one ' ' imaginria' ' it comes back to the world of century XVI, period where our thinking philosopher lives/(1596-1650), with the notice that we could say that they would appear as manchetes of great international periodicals: ' ' moderno' appears the calendar; ' , ' ' Brazil and the compassing are discovered ' ' , ' ' ' has beginning to the protestant reform in Germany; ' , ' ' Cames publishes ' ' The Lusadas' ' in Portugal ' ' , ' ' Leonardo of the Vinci, Michelangelo and Rafael prints a new skill of art in Italy that if expands for mundo' ' , ' ' Coprnico presents the hypothesis of a heliocntrico universe, causing the drastic disruption of the old and medieval world with the age moderna' '. .